/* SPDX-License-Identifier: GPL-2.0-only */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "pmutil.h" u16 get_pmbase(void) { return lpc_get_pmbase(); } void gpi_route_interrupt(u8 gpi, u8 mode) { u32 gpi_rout; if (gpi >= 16) return; alt_gpi_mask(1 << gpi, 0); gpe0_mask(1 << (gpi+16), 0); gpi_rout = pci_read_config32(PCI_DEV(0, 0x1f, 0), D31F0_GPIO_ROUT); gpi_rout &= ~(3 << (2 * gpi)); gpi_rout |= ((mode & 3) << (2 * gpi)); pci_write_config32(PCI_DEV(0, 0x1f, 0), D31F0_GPIO_ROUT, gpi_rout); if (mode == GPI_IS_SCI) gpe0_mask(0, 1 << (gpi+16)); else if (mode == GPI_IS_SMI) alt_gpi_mask(0, 1 << gpi); } /** * @brief Set the EOS bit */ void southbridge_smi_set_eos(void) { write_pmbase8(SMI_EN, read_pmbase8(SMI_EN) | EOS); } static void busmaster_disable_on_bus(int bus) { int slot, func; unsigned int val; unsigned char hdr; for (slot = 0; slot < 0x20; slot++) { for (func = 0; func < 8; func++) { u16 reg16; pci_devfn_t dev = PCI_DEV(bus, slot, func); val = pci_read_config32(dev, PCI_VENDOR_ID); if (val == 0xffffffff || val == 0x00000000 || val == 0x0000ffff || val == 0xffff0000) continue; /* Disable Bus Mastering for this one device */ reg16 = pci_read_config16(dev, PCI_COMMAND); reg16 &= ~PCI_COMMAND_MASTER; pci_write_config16(dev, PCI_COMMAND, reg16); /* If this is a bridge, then follow it. */ hdr = pci_read_config8(dev, PCI_HEADER_TYPE); hdr &= 0x7f; if (hdr == PCI_HEADER_TYPE_BRIDGE || hdr == PCI_HEADER_TYPE_CARDBUS) { unsigned int buses; buses = pci_read_config32(dev, PCI_PRIMARY_BUS); busmaster_disable_on_bus((buses >> 8) & 0xff); } } } } __weak void southbridge_gate_memory_reset(void) { } __weak void southbridge_smm_xhci_sleep(u8 slp_type) { } static int power_on_after_fail(void) { u8 s5pwr = CONFIG_MAINBOARD_POWER_FAILURE_STATE; /* save and recover RTC port values */ u8 tmp70, tmp72; tmp70 = inb(0x70); tmp72 = inb(0x72); get_option(&s5pwr, "power_on_after_fail"); outb(tmp70, 0x70); outb(tmp72, 0x72); /* For "KEEP", switch to "OFF" - KEEP is software emulated. */ return (s5pwr == MAINBOARD_POWER_ON); } static void southbridge_smi_sleep(void) { u32 reg32; u8 slp_typ; /* First, disable further SMIs */ write_pmbase8(SMI_EN, read_pmbase8(SMI_EN) & ~SLP_SMI_EN); /* Figure out SLP_TYP */ reg32 = read_pmbase32(PM1_CNT); slp_typ = acpi_sleep_from_pm1(reg32); printk(BIOS_SPEW, "SMI#: SLP = 0x%08x, TYPE = 0x%02x\n", reg32, slp_typ); southbridge_smm_xhci_sleep(slp_typ); /* Do any mainboard sleep handling */ mainboard_smi_sleep(slp_typ); /* Log S3, S4, and S5 entry */ if (slp_typ >= ACPI_S3) elog_gsmi_add_event_byte(ELOG_TYPE_ACPI_ENTER, slp_typ); /* Next, do the deed. */ switch (slp_typ) { case ACPI_S0: printk(BIOS_DEBUG, "SMI#: Entering S0 (On)\n"); break; case ACPI_S1: printk(BIOS_DEBUG, "SMI#: Entering S1 (Assert STPCLK#)\n"); break; case ACPI_S3: printk(BIOS_DEBUG, "SMI#: Entering S3 (Suspend-To-RAM)\n"); /* Gate memory reset */ southbridge_gate_memory_reset(); /* Invalidate the cache before going to S3 */ wbinvd(); break; case ACPI_S4: printk(BIOS_DEBUG, "SMI#: Entering S4 (Suspend-To-Disk)\n"); break; case ACPI_S5: printk(BIOS_DEBUG, "SMI#: Entering S5 (Soft Power off)\n"); write_pmbase32(GPE0_EN, 0); /* Always set the flag in case CMOS was changed on runtime. */ if (power_on_after_fail()) pci_and_config8(PCI_DEV(0, 0x1f, 0), D31F0_GEN_PMCON_3, ~1); else pci_or_config8(PCI_DEV(0, 0x1f, 0), D31F0_GEN_PMCON_3, 1); /* also iterates over all bridges on bus 0 */ busmaster_disable_on_bus(0); break; default: printk(BIOS_DEBUG, "SMI#: ERROR: SLP_TYP reserved\n"); break; } /* Write back to the SLP register to cause the originally intended * event again. We need to set BIT13 (SLP_EN) though to make the * sleep happen. */ write_pmbase32(PM1_CNT, reg32 | SLP_EN); /* Make sure to stop executing code here for S3/S4/S5 */ if (slp_typ >= ACPI_S3) halt(); /* In most sleep states, the code flow of this function ends at * the line above. However, if we entered sleep state S1 and wake * up again, we will continue to execute code in this function. */ reg32 = read_pmbase32(PM1_CNT); if (reg32 & SCI_EN) { /* The OS is not an ACPI OS, so we set the state to S0 */ reg32 &= ~(SLP_EN | SLP_TYP); write_pmbase32(PM1_CNT, reg32); } } /* * Look for Synchronous IO SMI and use save state from that * core in case we are not running on the same core that * initiated the IO transaction. */ static em64t101_smm_state_save_area_t *smi_apmc_find_state_save(u8 cmd) { em64t101_smm_state_save_area_t *state; int node; /* Check all nodes looking for the one that issued the IO */ for (node = 0; node < CONFIG_MAX_CPUS; node++) { state = smm_get_save_state(node); /* Check for Synchronous IO (bit0 == 1) */ if (!(state->io_misc_info & (1 << 0))) continue; /* Make sure it was a write (bit4 == 0) */ if (state->io_misc_info & (1 << 4)) continue; /* Check for APMC IO port */ if (((state->io_misc_info >> 16) & 0xff) != APM_CNT) continue; /* Check AX against the requested command */ if ((state->rax & 0xff) != cmd) continue; return state; } return NULL; } static void southbridge_smi_gsmi(void) { u32 *ret, *param; u8 sub_command; em64t101_smm_state_save_area_t *io_smi = smi_apmc_find_state_save(APM_CNT_ELOG_GSMI); if (!io_smi) return; /* Command and return value in EAX */ ret = (u32*)&io_smi->rax; sub_command = (u8)(*ret >> 8); /* Parameter buffer in EBX */ param = (u32*)&io_smi->rbx; /* drivers/elog/gsmi.c */ *ret = gsmi_exec(sub_command, param); } static void southbridge_smi_store(void) { u8 sub_command, ret; em64t101_smm_state_save_area_t *io_smi = smi_apmc_find_state_save(APM_CNT_SMMSTORE); uintptr_t reg_rbx; if (!io_smi) return; /* Command and return value in EAX */ sub_command = (io_smi->rax >> 8) & 0xff; /* Parameter buffer in EBX */ reg_rbx = (uintptr_t)io_smi->rbx; /* drivers/smmstore/smi.c */ ret = smmstore_exec(sub_command, (void *)reg_rbx); io_smi->rax = ret; } static int mainboard_finalized = 0; static void southbridge_smi_apmc(void) { u8 reg8; reg8 = apm_get_apmc(); switch (reg8) { case APM_CNT_ACPI_DISABLE: write_pmbase32(PM1_CNT, read_pmbase32(PM1_CNT) & ~SCI_EN); break; case APM_CNT_ACPI_ENABLE: write_pmbase32(PM1_CNT, read_pmbase32(PM1_CNT) | SCI_EN); break; case APM_CNT_FINALIZE: if (mainboard_finalized) { printk(BIOS_DEBUG, "SMI#: Already finalized\n"); return; } southbridge_finalize_all(); mainboard_finalized = 1; break; case APM_CNT_ELOG_GSMI: if (CONFIG(ELOG_GSMI)) southbridge_smi_gsmi(); break; case APM_CNT_SMMSTORE: if (CONFIG(SMMSTORE)) southbridge_smi_store(); break; } mainboard_smi_apmc(reg8); } static void southbridge_smi_pm1(void) { u16 pm1_sts; pm1_sts = reset_pm1_status(); dump_pm1_status(pm1_sts); /* While OSPM is not active, poweroff immediately * on a power button event. */ if (pm1_sts & PWRBTN_STS) { // power button pressed u32 reg32; reg32 = (7 << 10) | (1 << 13); elog_gsmi_add_event(ELOG_TYPE_POWER_BUTTON); write_pmbase32(PM1_CNT, reg32); } } static void southbridge_smi_gpe0(void) { u32 gpe0_sts; gpe0_sts = reset_gpe0_status(); dump_gpe0_status(gpe0_sts); } static void southbridge_smi_gpi(void) { u16 reg16; reg16 = reset_alt_gp_smi_status(); reg16 &= read_pmbase16(ALT_GP_SMI_EN); mainboard_smi_gpi(reg16); if (reg16) printk(BIOS_DEBUG, "GPI (mask %04x)\n", reg16); write_pmbase16(ALT_GP_SMI_STS, reg16); } static void southbridge_smi_mc(void) { u32 reg32; reg32 = read_pmbase32(SMI_EN); /* Are periodic SMIs enabled? */ if ((reg32 & MCSMI_EN) == 0) return; printk(BIOS_DEBUG, "Microcontroller SMI.\n"); } static void southbridge_smi_tco(void) { u32 tco_sts; tco_sts = reset_tco_status(); /* Any TCO event? */ if (!tco_sts) return; if (tco_sts & (1 << 8)) { // BIOSWR u8 bios_cntl; bios_cntl = pci_read_config8(PCI_DEV(0, 0x1f, 0), 0xdc); if (bios_cntl & 1) { /* BWE is RW, so the SMI was caused by a * write to BWE, not by a write to the BIOS */ /* This is the place where we notice someone * is trying to tinker with the BIOS. We are * trying to be nice and just ignore it. A more * resolute answer would be to power down the * box. */ printk(BIOS_DEBUG, "Switching back to RO\n"); pci_write_config8(PCI_DEV(0, 0x1f, 0), 0xdc, (bios_cntl & ~1)); } /* No else for now? */ } else if (tco_sts & (1 << 3)) { /* TIMEOUT */ /* Handle TCO timeout */ printk(BIOS_DEBUG, "TCO Timeout.\n"); } else { dump_tco_status(tco_sts); } } static void southbridge_smi_periodic(void) { u32 reg32; reg32 = read_pmbase32(SMI_EN); /* Are periodic SMIs enabled? */ if ((reg32 & PERIODIC_EN) == 0) return; printk(BIOS_DEBUG, "Periodic SMI.\n"); } typedef void (*smi_handler_t)(void); static smi_handler_t southbridge_smi[32] = { NULL, // [0] reserved NULL, // [1] reserved NULL, // [2] BIOS_STS NULL, // [3] LEGACY_USB_STS southbridge_smi_sleep, // [4] SLP_SMI_STS southbridge_smi_apmc, // [5] APM_STS NULL, // [6] SWSMI_TMR_STS NULL, // [7] reserved southbridge_smi_pm1, // [8] PM1_STS southbridge_smi_gpe0, // [9] GPE0_STS southbridge_smi_gpi, // [10] GPI_STS southbridge_smi_mc, // [11] MCSMI_STS NULL, // [12] DEVMON_STS southbridge_smi_tco, // [13] TCO_STS southbridge_smi_periodic, // [14] PERIODIC_STS NULL, // [15] SERIRQ_SMI_STS NULL, // [16] SMBUS_SMI_STS NULL, // [17] LEGACY_USB2_STS NULL, // [18] INTEL_USB2_STS NULL, // [19] reserved NULL, // [20] PCI_EXP_SMI_STS southbridge_smi_monitor, // [21] MONITOR_STS NULL, // [22] reserved NULL, // [23] reserved NULL, // [24] reserved NULL, // [25] EL_SMI_STS NULL, // [26] SPI_STS NULL, // [27] reserved NULL, // [28] reserved NULL, // [29] reserved NULL, // [30] reserved NULL // [31] reserved }; /** * @brief Interrupt handler for SMI# */ void southbridge_smi_handler(void) { int i, dump = 0; u32 smi_sts; /* We need to clear the SMI status registers, or we won't see what's * happening in the following calls. */ smi_sts = reset_smi_status(); /* Call SMI sub handler for each of the status bits */ for (i = 0; i < 31; i++) { if (smi_sts & (1 << i)) { if (southbridge_smi[i]) { southbridge_smi[i](); } else { printk(BIOS_DEBUG, "SMI_STS[%d] occurred," " but no handler available.\n", i); dump = 1; } } } if (dump) { dump_smi_status(smi_sts); } }